This mimics the equivalent assertion in concattable.

Since tree is manipulated in this loop, move the assertion inside the
tailcall.

There are three allocs in this function: one for the table, one for the
elements, and one for the block.  If any of these failed, the existing
allocations would leak.  Instead, clean them up before returning.

Previously, failing to allocate a lua_state would leak the Engine and
failing to manipulate the lua_state would leak the Engine and the state.
Instead, clean them up before returning.

This matches other similar checks in the same function.

I assume this is required to accept the DCO.

Updated unicode processing (which is done offline).  Currently skipping the generation of Ascii.rpl though.

REMOVED librosie.a from installation. Wrote make target "installcheck". Enhanced the output printed while uninstalling.

Addressed issue #112 about the README.md not giving enough credit to regex libraries that support the /x switch

Added an option to "make test" allowing the executable to be set on the make command line, so we can test installed rosie, not just from build directory